138785542 has 48 divisors (see below), whose sum is σ = 256746240. Its totient is φ = 55983312.

The previous prime is 138785531. The next prime is 138785567. The reversal of 138785542 is 245587831.

It is a super-2 number, since 2×138785542² = 38522853336467528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150559 + ... + 151477.

It is an arithmetic number, because the mean of its divisors is an integer number (5348880).

Almost surely, 2^138785542 is an apocalyptic number.

138785542 is a deficient number, since it is larger than the sum of its proper divisors (117960698).

138785542 is a wasteful number, since it uses less digits than its factorization.

138785542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1018 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 138785542 is about 11780.7275666658. The cubic root of 138785542 is about 517.7436033279.

The spelling of 138785542 in words is "one hundred thirty-eight million, seven hundred eighty-five thousand, five hundred forty-two".